I'll post more later but that rule pump isn't the best choice for your application and small stock lines.Lines i can see yes. I run 7/8 on my setup for that reason.
For a test you could use stock lines , then put bigger lines on and see the flow difference.
The inner cooler it’s self can only flow so much..
I’m running the 7 gallon tank and rule 2000 internal pump, I’ll be buying the big gun intercooler, I’d like to flow test it compared to the stock one
-J